Novocall - Novocall converts web visitors into sales calls in seconds.
Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.
OptinMonster - OptinMonster helps to convert abandoning website visitors into subscribers and customers.
BotStar - BotStar | Engage Customers Online with Live Chat & Chatbots
Callpage - Turn website visitors into sales calls. Use CallPage and provide immediate free phone callback to your leads in 28 seconds.
Telegram bot API - The Bot API allows you to easily create programs that use Telegram messages for an interface.